265 lines
12 KiB
Markdown
265 lines
12 KiB
Markdown
[](https://github.com/docker/build-push-action/releases/latest)
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[](https://github.com/marketplace/actions/build-and-push-docker-images)
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[](https://github.com/docker/build-push-action/actions?workflow=ci)
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[](https://github.com/docker/build-push-action/actions?workflow=test)
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[](https://codecov.io/gh/docker/build-push-action)
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## About
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GitHub Action to build and push Docker images with [Buildx](https://github.com/docker/buildx) with full support of the
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features provided by [Moby BuildKit](https://github.com/moby/buildkit) builder toolkit. This includes multi-platform
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build, secrets, remote cache, etc. and different builder deployment/namespacing options.
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___
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* [Usage](#usage)
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* [Git context](#git-context)
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* [Path context](#path-context)
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* [Advanced usage](#advanced-usage)
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* [Multi-platform image](docs/advanced/multi-platform.md)
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* [Secrets](docs/advanced/secrets.md)
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* [Isolated builders](docs/advanced/isolated-builders.md)
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* [Push to multi-registries](docs/advanced/push-multi-registries.md)
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* [Copy between registries](docs/advanced/copy-between-registries.md)
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* [Cache](docs/advanced/cache.md)
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* [Local registry](docs/advanced/local-registry.md)
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* [Export image to Docker](docs/advanced/export-docker.md)
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* [Share built image between jobs](docs/advanced/share-image-jobs.md)
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* [Test your image before pushing it](docs/advanced/test-before-push.md)
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* [Handle tags and labels](docs/advanced/tags-labels.md)
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* [Update DockerHub repo description](docs/advanced/dockerhub-desc.md)
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* [Customizing](#customizing)
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* [inputs](#inputs)
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* [outputs](#outputs)
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* [Troubleshooting](#troubleshooting)
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* [Keep up-to-date with GitHub Dependabot](#keep-up-to-date-with-github-dependabot)
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## Usage
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In the examples below we are also using 3 other actions:
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* [`setup-buildx`](https://github.com/docker/setup-buildx-action) action will create and boot a builder using by
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default the `docker-container` [builder driver](https://github.com/docker/buildx/blob/master/docs/reference/buildx_create.md#driver).
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This is **not required but recommended** using it to be able to build multi-platform images, export cache, etc.
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* [`setup-qemu`](https://github.com/docker/setup-qemu-action) action can be useful if you want
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to add emulation support with QEMU to be able to build against more platforms.
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* [`login`](https://github.com/docker/login-action) action will take care to log in against a Docker registry.
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### Git context
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By default, this action uses the [Git context](#git-context) so you don't need
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to use the [`actions/checkout`](https://github.com/actions/checkout/) action to
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check out the repository because this will be done directly by [BuildKit](https://github.com/moby/buildkit).
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The git reference will be based on the [event that triggered your workflow](https://docs.github.com/en/actions/reference/events-that-trigger-workflows)
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and will result in the following context: `https://github.com/<owner>/<repo>.git#<ref>`.
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```yaml
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name: ci
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on:
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push:
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branches:
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- 'main'
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jobs:
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docker:
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runs-on: ubuntu-latest
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steps:
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-
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name: Set up QEMU
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uses: docker/setup-qemu-action@v1
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-
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name: Set up Docker Buildx
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uses: docker/setup-buildx-action@v1
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-
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name: Login to DockerHub
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uses: docker/login-action@v1
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with:
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username: ${{ secrets.DOCKERHUB_USERNAME }}
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password: ${{ secrets.DOCKERHUB_TOKEN }}
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-
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name: Build and push
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uses: docker/build-push-action@v2
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with:
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push: true
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tags: user/app:latest
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```
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Be careful because **any file mutation in the steps that precede the build step
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will be ignored, including processing of the `.dockerignore` file** since
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the context is based on the Git reference. However, you can use the
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[Path context](#path-context) using the [`context` input](#inputs) alongside
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the [`actions/checkout`](https://github.com/actions/checkout/) action to remove
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this restriction.
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Default Git context can also be provided using the [Handlebars template](https://handlebarsjs.com/guide/)
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expression `{{defaultContext}}`. Here we can use it to provide a subdirectory
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to the default Git context:
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```yaml
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-
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name: Build and push
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uses: docker/build-push-action@v2
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with:
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context: "{{defaultContext}}:mysubdir"
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push: true
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tags: user/app:latest
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```
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> :warning: Subdirectory for Git context is not yet available for the buildx [`docker` driver](https://github.com/docker/buildx/blob/master/docs/reference/buildx_create.md#driver).
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Building from the current repository automatically uses the [GitHub Token](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token)
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so it does not need to be passed. If you want to authenticate against another
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private repository, you have to use a [secret](docs/advanced/secrets.md) named
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`GIT_AUTH_TOKEN` to be able to authenticate against it with buildx:
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```yaml
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-
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name: Build and push
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uses: docker/build-push-action@v2
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with:
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push: true
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tags: user/app:latest
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secrets: |
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GIT_AUTH_TOKEN=${{ secrets.MYTOKEN }}
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```
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### Path context
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```yaml
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name: ci
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on:
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push:
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branches:
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- 'main'
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jobs:
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docker:
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runs-on: ubuntu-latest
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steps:
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-
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name: Checkout
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uses: actions/checkout@v2
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-
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name: Set up QEMU
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uses: docker/setup-qemu-action@v1
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-
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name: Set up Docker Buildx
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uses: docker/setup-buildx-action@v1
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-
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name: Login to DockerHub
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uses: docker/login-action@v1
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with:
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username: ${{ secrets.DOCKERHUB_USERNAME }}
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password: ${{ secrets.DOCKERHUB_TOKEN }}
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-
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name: Build and push
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uses: docker/build-push-action@v2
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with:
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context: .
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push: true
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tags: user/app:latest
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```
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## Advanced usage
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* [Multi-platform image](docs/advanced/multi-platform.md)
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* [Secrets](docs/advanced/secrets.md)
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* [Isolated builders](docs/advanced/isolated-builders.md)
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* [Push to multi-registries](docs/advanced/push-multi-registries.md)
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* [Copy between registries](docs/advanced/copy-between-registries.md)
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* [Cache](docs/advanced/cache.md)
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* [Local registry](docs/advanced/local-registry.md)
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* [Export image to Docker](docs/advanced/export-docker.md)
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* [Share built image between jobs](docs/advanced/share-image-jobs.md)
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* [Test your image before pushing it](docs/advanced/test-before-push.md)
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* [Handle tags and labels](docs/advanced/tags-labels.md)
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* [Update DockerHub repo description](docs/advanced/dockerhub-desc.md)
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## Customizing
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### inputs
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Following inputs can be used as `step.with` keys
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> `List` type is a newline-delimited string
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> ```yaml
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> cache-from: |
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> user/app:cache
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> type=local,src=path/to/dir
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> ```
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> `CSV` type is a comma-delimited string
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> ```yaml
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> tags: name/app:latest,name/app:1.0.0
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> ```
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| Name | Type | Description |
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|---------------------|----------|------------------------------------|
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| `allow` | List/CSV | List of [extra privileged entitlement](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#allow) (e.g., `network.host,security.insecure`) |
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| `builder` | String | Builder instance (see [setup-buildx](https://github.com/docker/setup-buildx-action) action) |
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| `build-args` | List | List of build-time variables |
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| `cache-from` | List | List of [external cache sources](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#cache-from) (e.g., `type=local,src=path/to/dir`) |
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| `cache-to` | List | List of [cache export destinations](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#cache-to) (e.g., `type=local,dest=path/to/dir`) |
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| `cgroup-parent`¹ | String | Optional [parent cgroup](https://docs.docker.com/engine/reference/commandline/build/#use-a-custom-parent-cgroup---cgroup-parent) for the container used in the build |
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| `context` | String | Build's context is the set of files located in the specified [`PATH` or `URL`](https://docs.docker.com/engine/reference/commandline/build/) (default [Git context](#git-context)) |
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| `file` | String | Path to the Dockerfile. (default `{context}/Dockerfile`) |
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| `labels` | List | List of metadata for an image |
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| `load` | Bool | [Load](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#load) is a shorthand for `--output=type=docker` (default `false`) |
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| `network` | String | Set the networking mode for the `RUN` instructions during build |
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| `no-cache` | Bool | Do not use cache when building the image (default `false`) |
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| `outputs` | List | List of [output destinations](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#output) (format: `type=local,dest=path`) |
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| `platforms` | List/CSV | List of [target platforms](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#platform) for build |
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| `pull` | Bool | Always attempt to pull a newer version of the image (default `false`) |
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| `push` | Bool | [Push](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#push) is a shorthand for `--output=type=registry` (default `false`) |
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| `secrets` | List | List of secrets to expose to the build (e.g., `key=string`, `GIT_AUTH_TOKEN=mytoken`) |
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| `secret-files` | List | List of secret files to expose to the build (e.g., `key=filename`, `MY_SECRET=./secret.txt`) |
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| `shm-size`¹ | String | Size of [`/dev/shm`](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#-size-of-devshm---shm-size) (e.g., `2g`) |
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| `ssh` | List | List of SSH agent socket or keys to expose to the build |
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| `tags` | List/CSV | List of tags |
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| `target` | String | Sets the target stage to build |
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| `ulimit`¹ | List | [Ulimit](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#-set-ulimits---ulimit) options (e.g., `nofile=1024:1024`) |
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| `github-token` | String | GitHub Token used to authenticate against a repository for [Git context](#git-context) (default `${{ github.token }}`) |
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> ¹ `cgroup-parent`, `shm-size` and `ulimit` are only available using `moby/buildkit:master`
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> as builder image atm:
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> ```yaml
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> - name: Set up Docker Buildx
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> uses: docker/setup-buildx-action@v1
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> with:
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> driver-opts: |
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> image=moby/buildkit:master
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> ```
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### outputs
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Following outputs are available
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| Name | Type | Description |
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|-------------------|---------|---------------------------------------|
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| `digest` | String | Image content-addressable identifier also called a digest |
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| `metadata` | JSON | Build result metadata |
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## Troubleshooting
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See [TROUBLESHOOTING.md](TROUBLESHOOTING.md)
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## Keep up-to-date with GitHub Dependabot
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Since [Dependabot](https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-github-dependabot)
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has [native GitHub Actions support](https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#package-ecosystem),
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to enable it on your GitHub repo all you need to do is add the `.github/dependabot.yml` file:
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```yaml
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version: 2
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updates:
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# Maintain dependencies for GitHub Actions
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- package-ecosystem: "github-actions"
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directory: "/"
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schedule:
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interval: "daily"
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```
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